HCG's When? And How Much? Dosage Help.

I am taking 500mg of Testosterone Enanthate Per Week for 15 weeks. Also 30mg of D-Bol a day for the first 4 weeks AND 10mg of Nolvadex per day the whole time. I was going to start my clomid 2 weeks after my last injection and continue the nolvadex the whole time. When and how much should i take my Pregnyl (HCG). I just want to use it at the end not during my intake.